To begin, enter your organization's Tax Identification Number (TIN). If your organization has multiple TINs, you can enter more than one TIN.
Enter Your Organization's Nine-Digit TIN
Do not use hyphens, spaces or commas. Example: 123456789
Enter TIN
List of TINs
Remove TIN
  To add a new TIN, enter the number and click the Add TIN button. It will appear in the TIN List box. Repeat this process to add multiple TINs. When you have entered all desired TINs, click the Continue button.

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Questions? Learn more about this registration process.